# Process Capability Calculator — Cp Cpk Pp Ppk & SPC Charts

> Cp Cpk Pp Ppk & SPC Charts (iPhone/iPad app by Steven Greenwood.)

- Source: https://appshunter.io/ios/app/process-capability-calculator/id6813071769 (this page in markdown: same URL + `.md`)
- Developer: [Steven Greenwood](https://appshunter.io/developer/6813071771)
- Category: Business, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.6 · 1 MB
- Languages: American English
- Released: 2026-09-30
- Data updated: 2026-10-31

## What is Process Capability Calculator?

Know if your process is really capable. Cp, Cpk, Pp, Ppk, control charts, and SPC: built for the shop floor, but equally at home at your desk.

Free to use for as long as you want: type in your readings by hand, or try the built-in example data, and see full, real results. Verify it against your own known data before you ever need to unlock anything.

The Process Capability Calculator app works out Cp, Cpk, Pp, and Ppk correctly and keeps them properly distinct, runs full I-MR control charts with 15 SPC diagnostic rules, and tests your data for normality. Results also show sigma within and overall, DPMO, predicted failure rate, and a histogram of your readings. Everything is explained in plain language, not left as a number you have to trust blindly, including a guide to how many readings you really need.

Capture readings the way that actually suits the moment. Typing by hand is free. One unlock, with no subscription, reduces your typing:

Speak the data aloud
Scan printed data with your camera
Read a live machine display directly, in real time

The same unlock adds PDF reports, CSV export, and saved run history.

Built to work on your device. No account, no servers, and no data collected by the app. Calculations, charts and scanning need no internet connection, and speech recognition runs on your phone wherever your device supports it. Your camera, microphone, and readings are yours alone, and a report leaves your phone only if you choose to share it.

Honest about its own limits. Low-confidence scans get flagged for you to double-check, a reminder shows until you have 30 readings because a result from a handful of parts can't be fully trusted, and a result gets visibly marked VOID if it looks statistically good but the process is actually out of spec, out of control, or non-normal. A novice shouldn't be able to mistake a misleading number for a trustworthy one.

Built by a quality engineer with 35 years in automotive manufacturing, out of a genuine gap: getting a fast, trustworthy capability check on the shop floor was harder than it should be. This is the tool I wished I had.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Full Version | $2.99 | one-time |


## Is Process Capability Calculator safe?

Not enough ratings yet to assess Process Capability Calculator.

## Is Process Capability Calculator legit?

Process Capability Calculator has limited verification signals. The AppsHunter Legitimacy Score for Process Capability Calculator is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-10-16

Version 1.1: improved user interface.

- Easier data entry: clear outlined boxes, larger text, six rows ready to type into, and your choice of Oldest first or Newest first
- Try it in one tap with the free built-in example data
- Info buttons explain the control chart, Cpk and Ppk in plain language
- Every result panel always in view, with a clear reason when something is missing
- Built-in guidance on how many readings you need, and why 30 is the target

Calculations and scanning stay on your device.

### 1.0 — 2026-09-30

No release notes.

## Apps similar to Process Capability Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Merseyflow Quick Pay](https://appshunter.io/ios/app/merseyflow-quick-pay/id1481465973) | — | Free | Business |

## More apps by Steven Greenwood

- [Scatter Plot](https://appshunter.io/ios/app/scatter-plot/id6818815545)

All apps by Steven Greenwood: https://appshunter.io/developer/6813071771

## Related topics

[cpk](https://appshunter.io/ios/topics/cpk)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-31.*